word to describe one's ability to speak truthfully in a given situation

Question

I'm looking for a word that has the specific connotation/denotation about the speakers ability to speak truthfully based on their knowledge of the subject they are speaking about.

For example:

I can not speak with _ about your legal problem, because I am not an attorney.

I'd like the word to render the phrase after the comma redundant.

I don't think such a word exists (in English at least), So I'll accept foreign words, or wordsmithing if it makes the meaning of the word clear.

Answer 1

Authority would fit.

I cannot speak with any authority about your legal problem.

Answer 2

How about a simple "I am not qualified to..." or "I am not in a position to..."?

Answer 3

"authority" would be a reasonable choice in your sentence. I would reword it to say "I can not speak authoritatively ..." though.

Answer 4

I think perhaps you're looking for accuracy, rather than truthfulness. Were it truthfulness, I'd say perhaps "I can not speak forthrightly…"

Other than accuracy, I'd suggest authority.

Answer 5

My thought is: veracity. But the additional condition of not being a lawyer would negate the cannot, unless you really intended to say can not.

Answer 6

My first choice: "credibility". "Authority", already suggested, is also fine. Perhaps "reliably" as well.